Intel Skylake / Kaby Lake

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myocardia

Diamond Member
Jun 21, 2003
9,291
30
91
Haswell was the first one where they brought in the GT3e SKU, albeit only in a mobile incarnation. Broadwell was the first desktop chip to incorporate eDRAM, but Haswell was the first overall.

Cool, thanks for the info. I hadn't realized they had dipped their toes into the Crystalwell pool before Broadwell.
 

Fjodor2001

Diamond Member
Feb 6, 2010
3,990
440
126
Indeed. Ivy Bridge to Haswell gave us ~5-7% IPC improvement. Haswell to Skylake gives us 5-20% IPC improvement, depending on the type of software being utilized.

5-20 %... But the average was still around 5-7% for Skylake too on general benchmarks IIRC. And on some benchmarks there was even a regression.
 

DrMrLordX

Lifer
Apr 27, 2000
22,126
11,814
136
Haswell was the first one where they brought in the GT3e SKU, albeit only in a mobile incarnation. Broadwell was the first desktop chip to incorporate eDRAM, but Haswell was the first overall.

It wasn't mobile-only. The 4770R was a BGA desktop/SFF solution with CrystalWell eDRAM.
 

MikeA65

Junior Member
May 16, 2015
16
0
0
It doesn't rule out the possibility of happening.

But its extremely unlikely. L2 cache is part of the core. They'd have to change the layout of the entire core to accomodate the doubled L2 cache, unless its physical array is 512KB in size and half is disabled already. Then they'd have to worry about keeping latency the same and power in control.

Even less likely because Servers and Mobiles have one thing in common: Power efficiency is a great boon to both. If they cut down associativity on client to lower power do you think they won't do that on server but rather turn around, keep the associativity the same and DOUBLE the size? You think they'd go with increased power, significant change in core layout and entirely seperate validation on the core for that?

Remember the expression "look at the forest not the trees"? Lowering power(like with reduced L2 associativity) to allow more multi-threading abilities on server, is just that. These kind of speculations just reduce the credibility of those saying them(referring to David Kanter).

Why do you think that doubled L2 would result in "significantly better" IPC? And what is "significantly better"? 5%? Because that's what "significant" means in CPU design. Likely it won't even net 3%, on modern architectures where caches have multiple tiers optimized for every code category, with L1 and L2 being very fast, but small ones. If the doubled L2 cache increases latency even by a little bit, then you'd lose most of the advantages of doubled capacity, because the point of L2 is fast access. L3 cache is a different story.

In fact, on servers if that increase in IPC means power use per core increases so much that you have to cut down on few cores, then they wouldn't use that IPC increasing feature.

They have to change the layout anyway because of AVX-512, is not in the client silicon at all. The impression I got from Kanter was that the power saving from going 4 way was trivial, that the real savings was halving a 512 KB L2 to squeeze the client silicon into a 4.5 watt TDP. Apparently the 4.5 watt TDP was a late requirement that forced significant changes to client Skylake.

As for my guess of significantly better Server Skylake IPC, that's from more than just the L2. Client Skylake apparently had late changes to fit into a 4.5 watt TDP which the dedicated Server part doesn't have. In addition to a possible 8 way 512 KB L2 the server part has AVX-512 and everything needed to make it work. With the relatively low IPC increase of client Skylake the impression I got was that they castrated it to fit the 4.5 watt TDP. I felt we might see a more normal IPC increase with the server part.
 

ShintaiDK

Lifer
Apr 22, 2012
20,378
145
106
AVX-512 is very likely in the client silicon. Just disabled. They are not going to build an entire new core, just to remove AVX-512.

Its no different than how its normally segmented, i3, Pentiums etc.
 

witeken

Diamond Member
Dec 25, 2013
3,899
193
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AVX-512 is very likely in the client silicon. Just disabled. They are not going to build an entire new core, just to remove AVX-512.

Its no different than how its normally segmented, i3, Pentiums etc.

In the PPT it said different IP configurations for client and server.

Does server have ISP?
 

zir_blazer

Golden Member
Jun 6, 2013
1,192
487
136
I'm repeating this question:

Do someone knows already if its possible to overclock via Base Clock Multiplier Locked Skylakes? What about non-Z Motherboards? A budget combo with a cheap Pentium and a mid range Motherboard (Low end Chipset with strong VRMs) could be a rather popular choice.


There were some rumours than Skylake-E was going to use a different core than what Skylake uses. Makes sense that Skylake-E has AVX-512 and Skylake does not. We will know that for sure if Xeon E3 V5 omits AVX-512.
This is a first since the beginning of the multicore era, they used to be dies made from the very same cores in a specific generation in different amounts and extra features for some platforms. Even pre-multicore, you had examples like Athlons XP Thoroughbred and Barton where the only change was a slighty longer die to fit the extra Cache (Also repeated through Athlon 64 lifetime, like the 512 KB Cache L2 Venice and 1 MB Cache L2 San Diego, or Prescott and Prescott 2M), but otherwise identical.
 

MikeA65

Junior Member
May 16, 2015
16
0
0
AVX-512 is very likely in the client silicon. Just disabled. They are not going to build an entire new core, just to remove AVX-512.

Its no different than how its normally segmented, i3, Pentiums etc.

That was one of the things mentioned in the video, AVX-512 is not in the client silicon at all, not just fused off.
 

dark zero

Platinum Member
Jun 2, 2015
2,655
140
106
Wait... if the client chip and the server chip are different... so that means that the server socket might be different than the client one?
 

jpiniero

Lifer
Oct 1, 2010
15,303
5,824
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The Skylake guy did say that Skylake went through 2 "revolutions". Removing AVX-512 completely would make a bunch of sense just to save the transistors.
 

zir_blazer

Golden Member
Jun 6, 2013
1,192
487
136
Wait... if the client chip and the server chip are different... so that means that the server socket might be different than the client one?
Where have you been the last 3 generations? Check Sandy Bridge, Ivy Bridge and Haswell against Sandy Bridge-E, Ivy Bridge-E and Haswell-E Socket compatibility.
 

MikeA65

Junior Member
May 16, 2015
16
0
0
The Skylake Xeon is supposed to have 6 memory channels and over 3000 pins. That could raise the cost of the new Server and HEDT boards.
 

MikeA65

Junior Member
May 16, 2015
16
0
0
HEDT platform will use Socket R (LGA-2011) and only support 4 memory channels.

That is the current HEDT and server socket, the new sever socket is supposed to be Socket P. Where did you see it said that Skylake HEDT is no longer going to use the server CPU's and socket?
 
Mar 10, 2006
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That is the current HEDT and server socket, the new sever socket is supposed to be Socket P. Where did you see it said that Skylake HEDT is no longer going to use the server CPU's and socket?



Look at the bottom right corner @ the Basin Falls stuff. It says "Skylake Server socket R."

The HEDT will be using some variant of LGA 2011 again (probably electrically incompatible with LGA 2011-3) paired with Kaby Lake PCH.

In other words, it's not using thew Lewisberg PCH found in Purley which honestly looks like the Kaby Lake PCH with some additional server-related stuff baked in (i.e. 4x10GbE).
 

lopri

Elite Member
Jul 27, 2002
13,287
664
126
3 (4?) years ago I expected the 2500K may be my last desktop CPU purchase and Skylake does not change that. I am glad about it to tell the truth.
 

mohit9206

Golden Member
Jul 2, 2013
1,381
511
136
So when can we expect Skylake i3 and Pentium reviews? I am aiming at either G4500,i3-6100 or an A8 from AMD.
My current cpu is Pentium G630 from 2011 so even the G4500 should be a good deal faster especially the HD530 graphics which i intend to use for gaming at 720p until i can save up for a decent graphics card.
 

VirtualLarry

No Lifer
Aug 25, 2001
56,566
10,181
126

If they can sell these for under $180-200, I'll buy a couple. Hopefully, these ones will have 4GB RAM on them, unlike the Atom Compute Sticks that only have 2GB.

My MeegoPad T02 Compute Sticks thermal-throttle like a MOFO, after running Skype for 10-15 minutes (or less). It seems that they were not built for continuous CPU usage, even though they are only 4-5W TDP. Only seem to be good for "bursty" loads, like web browsing.
 

Sweepr

Diamond Member
May 12, 2006
5,148
1,143
131
When i upgraded from i5 2500k 4.5Ghz to i7 6700K 4.5Ghz i was surprised how much FPS went UP.
I made complete test with 8 games and here is example:

Skyrim + mods
2500k 4.5ghz 38fps http://abload.de/img/tesv_2015_08_25_13_17tmsse.png
6700k 4.5Ghz 56fps http://abload.de/img/tesv_2015_08_25_19_150asse.png

That's a big difference, considering both chips are overcocked. Please share more results with us.

mohit9206 said:
So when can we expect Skylake i3 and Pentium reviews? I am aiming at either G4500,i3-6100 or an A8 from AMD.
My current cpu is Pentium G630 from 2011 so even the G4500 should be a good deal faster especially the HD530 graphics which i intend to use for gaming at 720p until i can save up for a decent graphics card.

Shouldn't take too long till some Chinese review pops up.

Has anyone seen this?
Intel/MSI demonstrated mobile Core i7 6820HK being overclocked to 4.2GHz inside a notebook.
 
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